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Numerical simulation of non-adiabatic capillary tubes. Special emphasis on the near-saturation zone.

Author(s) : ABLANQUE N., OLIET C., RIGOLA J., et al.

Type of article: Article, IJR article

Summary

The aim of this article is to present a distributed numerical model that simulates the thermal and fluid-dynamic phenomena inside non-adiabatic capillary tubes. The resolution approach is based on a two-phase flow model where the fluid domain is discretized in a one-dimensional way, and the governing equations (continuity, momentum, and energy) are solved by means of a step-by-step algorithm. The model explained herein consists of an improved and extended version of previous works (Escanes et al., 1995; García-Valladares et al., 2002a,b; Ablanque et al., 2010) including two additional features. On the one hand, it allows the simulation of the two typical geometric arrangements found in capillary-tube/suction-line heat exchangers (i.e. concentric and lateral). On the other hand, it has an enhanced capability to address the convergence difficulties found in distributed models at the near-saturation zone. This document presents the major numerical adaptations done to the model, a comprehensive validation of the two geometric configurations, the model performance when tackling the aforementioned numerical difficulties and finally, some numerical studies.

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Pages: 153-167

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Details

  • Original title: Numerical simulation of non-adiabatic capillary tubes. Special emphasis on the near-saturation zone.
  • Record ID : 30014735
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 55
  • Publication date: 2015/07

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